CN110564089A - Degradable film and preparation method thereof - Google Patents
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- CN110564089A CN110564089A CN201910970015.3A CN201910970015A CN110564089A CN 110564089 A CN110564089 A CN 110564089A CN 201910970015 A CN201910970015 A CN 201910970015A CN 110564089 A CN110564089 A CN 110564089A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2403/02—Starch; Degradation products thereof, e.g. dextrin
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2497/00—Characterised by the use of lignin-containing materials
- C08J2497/02—Lignocellulosic material, e.g. wood, straw or bagasse
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
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- C08K5/053—Polyhydroxylic alcohols
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Abstract
The invention discloses a degradable film which is prepared from the following raw materials: a degradable film comprises the following components in percentage by weight: PVA50% -60%, corn starch 20% -30%, glycerin 20% -30%, cross-linking agent PLA2.5% -3%, filling modifier sugarcane fiber 20% -30% and purified water 870% -1000%, and a preparation method of the degradable film comprises the following steps: A. soaking: the method comprises the steps of adding 50-60% of PVA and 500-600% of purified water into a steam heating stirring tank, uniformly stirring, standing for later use, filling micromolecule filling modifier sugarcane fibers into macromolecular PVA and starch structures to obtain a PVA film with higher strength, enhancing the water resistance of the film, keeping certain strength and elasticity of the film after being soaked for a period of time, being capable of being recycled for the second time, finally hydrolyzing and breaking after being soaked for a long time, reducing the discard of wastes, and avoiding the overheating decomposition and the influence on crosslinking of organic raw materials such as starch by the methods of heating step by step and mixing step by step.
Description
Technical Field
The invention relates to the technical field of degradable films and preparation, in particular to a degradable film and a preparation method thereof.
Background
The situation characteristics of similar products in the current market are as follows: the PVA is used as a water-soluble material as a main component of a film, the product has the remarkable characteristics of water solubility, no toxicity, no odor, and capability of being degraded and utilized by microorganisms after being dissolved in water, the PVA has good antistatic effect after being formed into a film, can be directly printed without being subjected to corona treatment, but the manufacturing cost of the film is doubled compared with that of common plastics, the marketization process is slow, the strength of a food or non-food film made of the PVA is lower than that of the common plastics, but the degradation rate is very high, the environment protection effect is obvious, and the defects of similar products in the current market are as follows: the PVA film is very easy to dissolve in water, has insufficient water resistance, cannot be recycled for the second time, and is easy to dehydrate in a room temperature environment (the temperature is 25 ℃ and the humidity is 30%) after being prepared into the film, so that the film is dry, uneven, the service life is obviously shortened, the strength of the film is low, and all physical parameters of the film can not reach half of the strength of the common polyethylene film.
Disclosure of Invention
in order to solve the problems in the prior art, the invention provides a degradable film which can enhance the hydrophobicity and tensile strength and water retention capacity.
In order to achieve the purpose, the invention adopts the technical scheme that:
a degradable film comprises the following components in percentage by weight: PVA 50-60%, corn starch 20-30%, glycerin 20-30%, cross-linking agent PLA 2.5-3%, filling modifier sugarcane fiber 20-30% and purified water 870-1000%.
A preparation method of a degradable film comprises the following steps:
A. Soaking: adding PVA 50-60% and purified water 500-600% into a steam heating stirring tank, stirring uniformly, standing and then reserving for later use; 20-30% of corn starch and 200-300% of purified water are added into a container 1 and soaked for standby after 4-6 h; adding 20-30% of glycerol, 2.5-3% of cross-linking agent PLA and 100-200% of purified water into a container 2, and uniformly stirring for later use;
B. Dissolving: preheating an electric heating stirring tank for 30min, setting the temperature to be 100-120 ℃, heating for more than 4h, stirring the mixture at the power of 100W and the rotating speed of 80r/min, and uniformly adding the material soaked in the container 1 for 4-6 h into the electric heating stirring tank when the electric heating stirring tank is heated for 3-4 h;
C. Mixing: adding the materials in the container 1, stirring for 30-60 min, then slowly dripping the mixed solution in the container 2 into a tank, stirring for more than 20min, finally adding 2.5-3% of the sugarcane fibers filled with the modifier into the tank, and stirring to complete copolymerization and mixing;
D. Standing: c, standing the mixed material obtained in the step C for more than 1h at the temperature of 100-120 ℃;
E. film drawing: preheating a casting film machine in advance, transferring materials from an electric heating stirring tank to a material inlet of the casting film machine by using a pump, and performing casting film drawing and automatic winding;
F. drying: the degradable film is dried in a drying chamber in a sectional temperature-divided manner;
G. And (3) storage: and collecting the degradable film from the casting film machine, and rolling and storing.
Preferably, the time for the steam heating of the material in the stirring tank in the step A to stand is not less than 12 h.
Preferably, the step A is further added with water, and the container 1 is refilled with 250-300% of water.
the invention has the beneficial effects that:
(1) According to the invention, the sugarcane fibers filled with micromolecule filling modifiers are filled into macromolecular PVA and starch structures, and the PVA film with higher strength is obtained through the crosslinking action of the specific modifiers and the crosslinking agent PLA, so that the water resistance of the film is correspondingly enhanced, the film still keeps certain strength and elasticity after being soaked for a period of time, the film can be recycled for the second time, and is finally hydrolyzed and cracked after being soaked for a long time, the degradation process is very rapid, and the waste disposal is greatly reduced.
(2) the method of heating step by step and mixing step by step prevents organic raw materials such as starch and the like from being overheated and decomposed to influence crosslinking, and the sugarcane fibers filled with the modifier gradually can ensure that substances such as PVA, starch and the like are modified more completely and fully under the condition of uniform mixing, thereby avoiding various adverse factors caused by long-time heating.
(3) the mixture is more stable in structure and completely cured by standing for a long time.
(4) The film is prepared by adopting a tape casting method, so that the uniformity and the tensile strength of the film are effectively improved, the number of bubbles in the film is reduced by sectional cooling and drying, and the glossiness of the film is good.
Description of the drawings:
FIG. 1 is a schematic diagram of a production scheme of the present invention;
FIG. 2 is a schematic diagram of a production process of the present invention;
FIG. 3 is a schematic representation of the molecular structure of the mixture of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1:
the method for preparing a small amount of PVA degradable film in a laboratory comprises the following steps of; 100g of PVA100g, 40g of corn starch, 40g of glycerol, 5g of cross-linking agent PLA, 10g of filling modifier sugarcane fiber and 1700g of purified water.
Wherein, PVA and cross-linking agent PLA are mutually soluble effectually, and all have degradation, and glycerine has the plastification, and starch and filling modifier sugarcane fibre all have the filling effect, and make have fine biocompatibility between them.
a method for preparing a small amount of PVA degradable film in a laboratory, as shown in figures 1 and 2, comprises the following steps:
A. Soaking: adding PVA100g and 1000g of purified water into a steam heating stirring tank with the volume of 5L, uniformly stirring, and standing for 12h for later use; adding 40g of corn starch and 400g of purified water into a container 1 with the volume of 1L, and soaking for 4 hours for later use; 40g of glycerol, 5g of cross-linking agent PLA5g and 200g of purified water are added into a container 2 and are uniformly stirred for standby.
B. Dissolving: preheating the electric heating stirring tank for 30min, setting the temperature at 100 ℃, heating for 4h, stirring the mixture for 100W, rotating the mixture at a speed of 80r/min, uniformly heating and completely dissolving the mixture in the electric heating stirring tank by continuously stirring, and uniformly adding the material soaked in the container 1 for 4h into the electric heating stirring tank when the electric heating stirring tank is heated for 3 h.
B1, water replenishing: 500g of water is replenished in the container 1 again, and considering that PVA is not easy to dissolve and much water is evaporated in the dissolving process, 500g of water is replenished in the container 1 again to ensure the water content and viscosity of the prepared glue solution, and compared with the existing degradable film, the prepared film is not easy to dehydrate in the room temperature environment (the temperature is 25 ℃ and the humidity is 30 percent), the water content of the film is more, the internal structure is flat, and the service life is prolonged;
C. mixing: adding the materials in the container 1, stirring for 30min, then slowly dripping the mixed solution in the container 2 into the tank, stirring for 20min, finally adding 2.5g of the sugarcane fibers filled with the modifier into the tank, and stirring to complete copolymerization and mixing;
heating step by step and mixing step by step are realized in the steps of dissolving and mixing, so that organic raw materials such as starch and the like are not overheated to decompose and influence crosslinking, and the sugarcane fiber filled with the modifier is gradually added, so that PVA, starch and other substances are completely and fully modified under the condition of uniform mixing, and various adverse factors caused by long-time heating are avoided;
D. Standing: c, standing the mixed material obtained in the step C for more than 1h at the temperature of 100 ℃, and setting a longer standing time to enable the mixture structure to be more stable and the mixture to be completely cured;
E. film drawing: preheating a casting film machine in advance, transferring materials from an electric heating stirring tank to a material inlet of the casting film machine by using a pump, casting and drawing a film according to the process flow of the casting film machine, and automatically winding, wherein the film is prepared by a casting method so that the uniformity and the tensile strength of the film are effectively improved;
F. Drying: the degradable film is dried in the drying chamber in a segmented temperature-division manner, so that the forming of the film is facilitated, and meanwhile, segmented cooling and drying are realized by utilizing a segmented temperature-division drying manner, so that the number of bubbles in the film is reduced, and the glossiness of the film is better;
G. And (3) storage: and collecting the degradable film from the casting film machine, and rolling and storing.
as shown in figure 3, the invention fills micromolecule filling modifier sugarcane fibers into macromolecular PVA and starch structures, obtains a PVA film with higher strength through the crosslinking action of specific modifier and crosslinking agent PLA, correspondingly enhances the water resistance of the PVA film, and the PVA film still keeps certain strength and elasticity after being soaked in water for a period of time and is finally hydrolyzed and cracked, the degradation process is very rapid, and the waste discarding is greatly reduced.
Multiple tests prove that the thickness of the disposable shopping bag is 0.05 mm, the prepared shopping bag can bear 30 jin of weight, and the longitudinal and transverse tensile strength of the disposable shopping bag reaches the strength standard of supermarket plastic bags regulated by the state; the film is made into an agricultural mulching film with the width of 0.015 millimeter and the width of 120 centimeters and is used for planting the snake melons, after three months, the film can not be seen by naked eyes, the problems of heat preservation, water retention and weed transverse growth are solved in the growth process of the snake melons, environment hazards such as pesticides do not need to be applied correspondingly, after the growth cycle of the snake melons is passed, the film is degraded quickly through the combined action of rainwater, light, heat, soil and microorganisms, and the troubles such as mulching film recovery and white pollution to the land are eliminated; the film is made into an aluminum alloy door and window outer packaging belt with the width of 0.05 mm and the width of 15 cm, the process of removing static electricity by corona treatment can be omitted, trademark patterns are directly printed, and according to a normal winding mode, the door and window can be completely ensured to be not deformed, not leave water stains and not rust key parts in the processes from leaving factory to mounting and using, and the product can be completely degraded in 6 months after being mounted and not leave traces; the wall decoration is manufactured by electronic spraying, and common wooden walls can be directly washed and wiped off when patterns are replaced, so that the powerful cleaning work is saved, the wall decoration can be replaced regularly according to personal preference, and plastic packaging waste is not generated; the film solution is diluted and added with corresponding pigment to prepare water-soluble pigment which is used for printing cross-stitch patterns and other patterns needing water-soluble function, so that the trouble of color search for embroidery points can be saved, and the whole embroidery is directly washed after finishing embroidery, thus being brand-new. After tests, the product is soaked for one hour and washed by common water, and is clean as new.
EXAMPLE 2
a degradable film comprises the following components in percentage by weight: PVA 50-60%, corn starch 20-30%, glycerin 20-30%, cross-linking agent PLA 2.5-3%, filling modifier sugarcane fiber 20-30% and purified water 870-1000%.
Wherein, PVA and cross-linking agent PLA are mutually soluble effectually, and all have degradation, and glycerine has the plastification, and starch and filling modifier sugarcane fibre all have the filling effect, and make have fine biocompatibility between them.
A preparation method of a degradable film comprises the following steps:
A. Soaking: adding PVA 50-60% and purified water 500-600% into a steam heating stirring tank, uniformly stirring, and standing for more than 12h for later use; 20-30% of corn starch and 200-300% of purified water are added into a container 1 and soaked for standby after 4-6 h; 20 to 30 percent of glycerin, 2.5 to 3 percent of cross-linking agent PLA and 100 to 200 percent of purified water are added into the container 2 and evenly stirred for later use.
B. Dissolving: preheating the electric heating stirring tank for 30min, setting the temperature to be 100-120 ℃, heating for more than 4h, stirring the material at the stirring power of 100W and the rotating speed of 80r/min, and uniformly adding the material soaked in the container 1 for 4-6 h into the electric heating stirring tank when the electric heating stirring tank is heated to 3-4 h.
B1, water replenishing: 250% -300% of water is replenished again in the container 1, considering that PVA is not easy to dissolve, and the water evaporation is much in the dissolving process, 250% -300% of water is replenished again in the container 1 to ensure the water content and viscosity of the prepared glue solution, and compared with the existing degradable film, the film is not easy to dehydrate in the room temperature environment (the temperature is 25 ℃ and the humidity is 30%) after being made into the film, the water content of the film is more, the internal structure is smooth, and the service life is prolonged.
C. Mixing: adding the materials in the container 1, stirring for 30-60 min, then slowly dripping the mixed solution in the container 2 into the tank, stirring for more than 20min, finally adding 2.5-3% of the sugarcane fibers filled with the modifier into the tank, and stirring to complete copolymerization and mixing.
D. standing: and C, standing the mixed material obtained in the step C for more than 1h at the temperature of between 100 and 120 ℃.
E. Film drawing: preheat the curtain coating membrane machine in advance, utilize the pump to shift the material to curtain coating membrane machine material entrance from the electrical heating agitator tank, draw membrane, automatic rolling according to specific process flow curtain coating.
F. drying: and the degradable film is dried in the drying chamber in a sectional temperature-divided manner.
G. And (3) storage: and collecting the degradable film from the casting film machine, and rolling and storing.
The working principle of embodiment 2 is the same as that of embodiment 1.
EXAMPLE 3
a degradable film comprises the following components in percentage by weight: PVA50%, corn starch 20%, glycerin 20%, cross-linking agent PLA2.5%, filling modifier sugarcane fiber 20% and purified water 870%.
Wherein, PVA and cross-linking agent PLA are mutually soluble effectually, and all have degradation, and glycerine has the plastification, and starch and filling modifier sugarcane fibre all have the filling effect, and make have fine biocompatibility between them.
As shown in fig. 1 and 2, a method for preparing a degradable film includes the following steps:
A. Soaking: adding PVA50% and 500% of purified water into a steam heating stirring tank, uniformly stirring, and standing for 12h for later use; adding 20% of corn starch and 200% of purified water into a container 1, and soaking for 4 hours for later use; 20 percent of glycerin, 2.5 percent of cross-linking agent PLA and 100 percent of purified water are added into the container 2 and are uniformly stirred for standby.
B. Dissolving: preheating the electric heating stirring tank for 30min, setting the temperature at 100 ℃, heating for more than 4h, stirring with the power of 100W and the rotating speed of 80r/min, and uniformly adding the material soaked in the container 1 for 4h into the electric heating stirring tank when the electric heating stirring tank is heated to 3 h.
B1, water replenishing: 250% of water is replenished again in the container 1, considering that PVA is not easy to dissolve, the water evaporation is more in the dissolving process, 250% -300% of water is replenished again in the container 1 to ensure the water content and the viscosity of the prepared glue solution, and compared with the existing degradable film, the film is not easy to dehydrate in the room temperature environment (the temperature is 25 ℃ and the humidity is 30%) after being made into the film, the water content of the film is more, the internal structure is smooth, and the service life is prolonged.
C. Mixing: adding the materials in the container 1, stirring for 30min, then slowly dripping the mixed solution in the container 2 into the tank, stirring for more than 20min, finally adding 2.75% of the sugarcane fibers filled with the modifier into the tank, and stirring to complete copolymerization and mixing.
D. Standing: and C, standing the mixed material obtained in the step C for more than 1h at the temperature of 100 ℃.
E. Film drawing: preheat the curtain coating membrane machine in advance, utilize the pump to shift the material to curtain coating membrane machine material entrance from the electrical heating agitator tank, draw membrane, automatic rolling according to specific process flow curtain coating.
F. Drying: and the degradable film is dried in the drying chamber in a sectional temperature-divided manner.
G. And (3) storage: and collecting the degradable film from the casting film machine, and rolling and storing.
The working principle of embodiment 3 is the same as that of embodiment 1.
example 4
A degradable film comprises the following components in percentage by weight: PVA55%, corn starch 25%, glycerin 25%, cross-linking agent PLA2.75%, filling modifier sugarcane fiber 25% and purified water 935%.
wherein, PVA and cross-linking agent PLA are mutually soluble effectually, and all have degradation, and glycerine has the plastification, and starch and filling modifier sugarcane fibre all have the filling effect, and make have fine biocompatibility between them.
A preparation method of a degradable film comprises the following steps:
A. soaking: adding PVA55% and 550% of purified water into a steam heating stirring tank, uniformly stirring, and standing for more than 12h for later use; adding 25% of corn starch and 250% of purified water into the container 1, and soaking for 5 hours for later use; 25% of glycerol, 2.75% of cross-linking agent PLA and 150% of purified water are added into the container 2 and uniformly stirred for later use.
B. Dissolving: preheating the electric heating stirring tank for 30min, setting the temperature at 110 ℃, heating for more than 4h, stirring with the power of 100W and the rotating speed of 80r/min, and uniformly adding the material soaked in the container 1 for 5h into the electric heating stirring tank when the electric heating stirring tank is heated to 3.5 h.
b1, water replenishing: and 275% of water is replenished in the container 1 again, the PVA is considered to be not easy to dissolve, the water evaporation in the dissolving process is more, 275% of water is replenished in the container 1 again to ensure the water content and the viscosity of the prepared glue solution, and the film is made to be not easy to lose water relative to the existing degradable film in the room temperature environment (the temperature is 25 ℃ and the humidity is 30%), the water content of the film is more, the internal structure is smooth, and the service life is prolonged.
C. mixing: adding the materials in the container 1, stirring for 45min, slowly dripping the mixed solution in the container 2 into the tank, stirring for more than 20min, finally adding 2.75% of the sugarcane fibers filled with the modifier into the tank, and stirring to complete copolymerization and mixing.
D. standing: and C, standing the mixed material obtained in the step C for more than 1h at the temperature of 110 ℃.
E. Film drawing: preheat the curtain coating membrane machine in advance, utilize the pump to shift the material to curtain coating membrane machine material entrance from the electrical heating agitator tank, draw membrane, automatic rolling according to specific process flow curtain coating.
F. Drying: and the degradable film is dried in the drying chamber in a sectional temperature-divided manner.
G. and (3) storage: and collecting the degradable film from the casting film machine, and rolling and storing.
Example 4 operates according to the same principle as example 1
EXAMPLE 5
a degradable film comprises the following components in percentage by weight: PVA60%, corn starch 30%, glycerin 30%, cross-linking agent PLA3%, filling modifier sugarcane fiber 30% and purified water 1000%.
Wherein, PVA and cross-linking agent PLA are mutually soluble effectually, and all have degradation, and glycerine has the plastification, and starch and filling modifier sugarcane fibre all have the filling effect, and make have fine biocompatibility between them.
A preparation method of a degradable film comprises the following steps:
A. Soaking: adding PVA60% and 600% of purified water into a steam heating stirring tank, uniformly stirring, and standing for more than 12h for later use; 30% of corn starch and 300% of purified water are added into the container 1 and soaked for standby after 6 hours; 30% of glycerol, 3% of cross-linking agent PLA and 200% of purified water are added into a container 2 and uniformly stirred for later use.
B. dissolving: preheating the electric heating stirring tank for 30min, setting the temperature at 120 ℃, heating for more than 4h, stirring with the power of 100W and the rotating speed of 80r/min, and uniformly adding the material soaked in the container 1 for 6h into the electric heating stirring tank when the electric heating stirring tank is heated to 4 h.
B1, water replenishing: 300% of water is replenished again in the container 1, considering that PVA is not easy to dissolve, the evaporation of water is more in the dissolving process, 300% of water is replenished again in the container 1 to ensure the water content and the viscosity of the glue solution, and the film is made to be not easy to lose water relative to the existing degradable film in the room temperature environment (the temperature is 25 ℃ and the humidity is 30%), the water content of the film is more, the internal structure is smooth, and the service life is prolonged.
C. mixing: adding the materials in the container 1, stirring for 60min, then slowly dripping the mixed solution in the container 2 into the tank, stirring for more than 20min, finally adding 3% of the sugarcane fibers filled with the modifier into the tank, and stirring to complete copolymerization and mixing.
D. Standing: and C, standing the mixed material obtained in the step C for more than 1h at the temperature of 120 ℃.
E. Film drawing: preheat the curtain coating membrane machine in advance, utilize the pump to shift the material to curtain coating membrane machine material entrance from the electrical heating agitator tank, draw membrane, automatic rolling according to specific process flow curtain coating.
F. Drying: and the degradable film is dried in the drying chamber in a sectional temperature-divided manner.
G. And (3) storage: and collecting the degradable film from the casting film machine, and rolling and storing.
The working principle of embodiment 5 is the same as that of embodiment 1.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (4)
1. a degradable film is characterized in that the degradable film comprises the following components in percentage by weight: PVA 50-60%, corn starch 20-30%, glycerin 20-30%, cross-linking agent PLA 2.5-3%, filling modifier sugarcane fiber 20-30% and purified water 870-1000%.
2. a method for preparing a degradable film based on the degradable film of claim 1, comprising the steps of:
A. Soaking: adding PVA 50-60% and purified water 500-600% into a steam heating stirring tank, stirring uniformly, standing and then reserving for later use; 20-30% of corn starch and 200-300% of purified water are added into a container 1 and soaked for standby after 4-6 h; adding 20-30% of glycerol, 2.5-3% of cross-linking agent PLA and 100-200% of purified water into a container 2, and uniformly stirring for later use;
B. Dissolving: preheating an electric heating stirring tank for 30min, setting the temperature to be 100-120 ℃, heating for more than 4h, stirring the mixture at the power of 100W and the rotating speed of 80r/min, and uniformly adding the material soaked in the container 1 for 4-6 h into the electric heating stirring tank when the electric heating stirring tank is heated for 3-4 h;
C. Mixing: adding the materials in the container 1, stirring for 30-60 min, then slowly dripping the mixed solution in the container 2 into a tank, stirring for more than 20min, finally adding 2.5-3% of the sugarcane fibers filled with the modifier into the tank, and stirring to complete copolymerization and mixing;
D. Standing: c, standing the mixed material obtained in the step C for more than 1h at the temperature of 100-120 ℃;
E. Film drawing: preheating a casting film machine in advance, transferring materials from an electric heating stirring tank to a material inlet of the casting film machine by using a pump, and performing casting film drawing and automatic winding;
F. Drying: the degradable film is dried in a drying chamber in a sectional temperature-divided manner;
G. And (3) storage: and collecting the degradable film from the casting film machine, and rolling and storing.
3. The method for preparing degradable film according to claim 2, wherein the time for steam heating the material in the stirring tank in step A to stand is not less than 12 h.
4. the method for preparing a degradable film according to claim 2, wherein the step A is further added with water, and the container 1 is refilled with 250-300% water.
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Cited By (1)
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